Introduction to GSM Technology Project:

GSM subscriber telephony services:

Under this, the services are ability to make and receive calls to fixed and mobile subscribers all over the world, DTMF, emergency calls, FAX, SMS, cell broadcast.

CME 20 in GSM supports some supplementary services which can compliment and modify both tele services and bearer.

Call forwarding includes call forwarding on MS not reachable, call forwarding on MS busy, call forwarding on no reply, call forwarding unconditional. There are three kinds of call barring namely barring of all outgoing calls, barring of all outgoing international calls, barring of all outgoing international except those directed to home PLMN. Call hold is a supplementary service which is used to interrupt the ongoing call and make secondary calls without disconnecting first call. 

Basic building blocks of GSM:

A cellular mobile system consists of Mobile Station (MS), Base Station (BS), Mobile Services Switching Centers (MSC), Operation and Maintenance Centre (OMC). GSM is broadly divided into switching system (SS) and Base Station System (BSS). Each of these contains functional units. The Switching System (SS) includes Mobile Services Switching Centre (MSC), Visitor Location Register (VLR), Home Location Register (HLR), Authentication Centre (AC), and Equipment Identity Register (EIR). The BSS includes Base Station Controller (BSC), Base Tran receiver Station (BTS).

Download  GSM Technology Project Report .